Electro-magnetic car-brake



(No Model.)

H. S. PARK.

ELEUTRO MAGNETIC GAR BRAKE.

N0..296.349. Patented A rys, 1884.

Invnfor:

" Harvey ,1 1 am N. PETERS. Phamuuw rn hu. Washington. a. c.

' UNITED STATES PATENT Fries.

HARVEY s. PARK, or HENDERSON, KENTUCKY.

ELECTRO-MAGNETIC CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 296,349, dated April 8, 1884.

Application filed September 1, 1883. (No model.)

To all whom it may concern.-

Be it known that I, HARVEY S. PARK, a citizen of the United States, residing at Hender son, in the county of Henderson and State of Kentucky, have invented certain new and useful Improvements in Electro-Magnetic Gar- Brakcs, of which the following is a specification.

My invention relates to improvements in those electromagnetic oar-brakes described in my co-pending application for Letters Patent, in which the dynamo or other source of electricity is placed upon the locomotive, with conductors connecting the same to each car of the train, means being provided by which an electrical current may be directed into such conductors to energize an electro magnet or magnets on one or more of the cars for the purpose of actuating a clutch-disk to wind a brake-- chain and apply the brakes.

My present invention consists in the combination, within the frame of the braking apparatus, of two sets of electro-magnets, each having separate electrical communication with the generator, said electro-magnets being placed face to face, and having a clutch-disk placed between their faces and upon the shaft which carries the drum upon which the brake-chain is wound.

In order that my invention may be fully un derstood, I will proceed to describe it with reference-t0 the accompanying drawings, in which- Figure I represents an under side View of the clutch mechanism. Fig. II is a vertical section thereof on the line II II, Fig. I.

1 represents a metallic frame, fixed by any suitable means to the under side of the car, or to the car-truck. J ournaled transversely in such frame is a shaft, 2, bearing at one end disks or flanges 3, between which a brakechain, 4., is adapted to be wound on such shaft.

5 is a circular casing containing a number of electro-magnets, 6, and fixed to a hub, 7, which revolves freely on the shaft 2. The hub 7 is provided with circumferential rings 8, of brass or other conducting material, with which the brushes 9 are kept in constant contact for the purpose of conveying current to and from the conductors 10 10, which are connected, respectively, to the positive and negative poles of the generator through the medium of a suitable switch board. The rings 8 have electrical connection with the coils of the electro-magnets 6. v

A second casing, 11, is rigidly attached to the frame 1, and contains asecond series of electro-magnets, 12, whose poles are placed face to face with those of the first casing, at a sufficient distance therefrom to allow of the rotation between the two casings of a disk, 13, of steel or soft iron, the hub 14 of which surrounds the shaft 2. A feather, 15, upon said shaft, occupying a groove on the inner face of the hub of the disk, allows longitudinal motion of the disk upon the shaft, while at the same time preventing its rotary motion thereon. The second series of electro-magnets, 12, are also connected by conductors 16 16 with the switchboard, under the control of the conductor or engineer, or both. A belt, 17, surrounds the periphery of easing 5, and transmits continuous motion thereto, during the movement of the train, from one of the car-axles. It will now be seen that if a current be thrown into the circuit 10 9 8 6, 810.

such disk, being forced thereby to revolve, will carry with it shaft 2, wind up brake-chain 4, and thus apply the brakes. When the desired strength of brake application is reached, the current is diverted from the braking-circuit to the circuit 16 12 16, and the second series of electro-magnets, 12, thereby polarized, attracting and retaining in their turn the armaturedisk 13, and thus locking the brakes to the desired position. When the brakes are to be taken off, the current is in turn diverted from the second series of electro-magnets, and the brakes are allowed to fall back or are thrown back by means of springs.

All matter shown and described but not claimed in the present application I have claimed in my before-mentioned co-pending circuits, the armature-disk upon the brakingshaft, placed between the faces of such electromagnets, and adapted to be operated thereby to effect the application or locking of the of magnets and a fixed series of magnets whose 10 brakes substantially as set forth. poles are opposite eaeh other, of an armature 2. The combination, with the shaft 2, 0f the disk fixed to its shaft between said magnets by eontinuously-revolving series of e1ectr0-n1aga spline and groove, and adapted to be attract- 5 nets 6 loose on said shaft, having hub 7 with ed by either, as and for the purposes set forth.

i tn esses:

J on F. J OIINSON, J'. \V. KYLE.

placed opposite the faces of such eleetre-inagnets for the purpose of applying the brakes.

conducting-rings and brushes and aeiuteh-disk I HARVEY S. PARK.

3. The e0n1binati0n,with a revolving series I 

